Ming Li et al 2008 J. Phys. A: Math. Theor. 41 202002 doi:10.1088/1751-8113/41/20/202002
Separability and entanglement of quantum states based on covariance matrices
FREE ARTICLEMing Li1, Shao-Ming Fei1,2 and Zhi-Xi Wang1
Show affiliationsFAST TRACK COMMUNICATION
We investigate the separability of quantum states based on covariance matrices. Separability criteria are presented for multipartite states. The lower bound of concurrence proposed in Vicente (2007 Phys. Rev. A 75 052320) is improved by optimizing the local orthonormal observables.
- PACS
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03.67.Lx Quantum computation architectures and implementations
03.67.Dd Quantum cryptography and communication security
03.67.Mn Entanglement measures, witnesses, and other characterizations
- MSC
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94A60 Cryptography (See also 11T71, 14G50, 68P25)
94A15 Information theory, general (See also 62B10)
81P68 Quantum computation and quantum cryptography (See also 68Q05, 94A60)
- Subjects
- Dates
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Issue 20 (23 May 2008)
Received 30 December 2007, in final form 25 March 2008
Published 30 April 2008
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Separability and entanglement of quantum states based on covariance matrices
Ming Li et al 2008 J. Phys. A: Math. Theor. 41 202002
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